diff --git a/src/twoPlayers.h b/src/twoPlayers.h
index 3df27fa07eb16fbdf39d4f9dcbd20906b23ac2a2..881b72163d28c66aef664d28e72e65725d6b16ce 100644
--- a/src/twoPlayers.h
+++ b/src/twoPlayers.h
@@ -1,8 +1,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
+#include "board.h"
 
-
-void print_game();
+#ifndef twoplayers_h
+#define twoplayers_h
 void play();
 bool winner();
+#endif